High speed power boat for calm and rough seaways

US4649851A · kind A · utility

Inventor

• Edward April · Mystic, US

Key dates

• Filing date: Sep 12, 1985
• Grant date: Mar 17, 1987
• Expiry date: Sep 12, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T70/10
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

Hydrocraft, capable of maintaining comfortable seaworthy performance at both low and high speeds, in both calm and rough seas, wherein its hull form coordinates high efficiency of at least two zero deadrise planing surfaces with a wave piercing, wedge effect bow segment. The forward portion of the respective concave sides of the bow intersect at the centerline of the hull. The sides of the forward body of the hull rise from the bottom at the chine, vertically then upwardly and outwardly in a concave curvature, the form of which will load the side skin in tension. At a preselected point above the hull bottom, the sharp edged bow is truncated in a conical, forward sloping surface to provide an upward hydrodynamic force to lift the hull over waves which are higher than the gunwale. The parallel after body is located above the after planing surface, and a conical transom closes the stern. The two zero deadrise planing surfaces, of fluted section will present a positive angle of attack to the water surface when the hull has a zero angle of trim. The craft planing surfaces are step connected.